usci-check: Verify Chinese business-licence codes offline, in-browser

Hi Product Hunt - I run a small verification studio helping importers check Chinese suppliers. A recurring problem: the 18-character registration code on Chinese business licences gets mistyped or invented, and most buyers can't reach the official registry to check. The code itself has structure and a check digit (GB 32100-2015), so transcription errors are catchable offline. We open-sourced the checker (MIT, zero dependencies, tested against 2,149 real codes from government disclosure files) and put a free browser version online - nothing you type leaves your browser. One honest limit, stated on the page itself: a passing check proves the code was transcribed correctly, not that the company exists or deserves your money. That needs the actual registry record. Feedback very welcome, especially from anyone who sources from China.